The present invention relates to a slanting-bed feed processing machine tool of a large propeller. The machine tool comprises a slanting column feed bed, a machine tool spindle, a workpiece rotary worktable, a large propeller and a bed feed mechanism. The present invention coordinates the geometrical relationship between the machine tool and the large propeller to ensure that the slanting column feed bed moves between two blades, thereby reducing the overhang length of the spindle. Different forms of workpiece rotary worktables and bed feed mechanisms are selected according to different slanting column feed beds. Four types of slanting column feed beds are designed, which can be selected, optimized and applied for different processing objects. The present invention enhances the processing stiffness of the spindle and solves the problem of poor processing quality of the large propeller caused by machine tool vibration.

A machine for machining workpieces, including a first column and a second column facing each other according to a first horizontal axis, a guide system guided displacement of at least one of the columns in parallel with the first horizontal axis, one or two tool units, each tool unit being arranged on respective column for controlled displacement perpendicularly to the first horizontal axis, on each column, a workpiece holding device, at least one of the workpiece holding devices being arranged for controlled displacement in parallel with the first horizontal axis, where the workpiece holding devices are arranged for supporting a workpiece between them and for controlled rotation of the workpiece around a workpiece axis parallel with the first horizontal axis.

The present invention relates to an actively dampened centerless grinding process for a centerless grinding machine having wheels, between which there is arranged a part to be ground, and heads carrying the wheels, which process has moving the wheels closer to one another by applying pressure on the part for the grinding thereof, such that vibrations are generated in the grinding machine due to grinding, measuring the vibrations due to grinding, and introducing, depending on the measurement, an active damping force (F.sub.act) parallel to the force flow of the grinding machine and by means of using an inertial actuator acting directly on one of the heads, such that the vibrations due to grinding are attenuated.

The present invention relates to an actively dampened centerless grinding process for a centerless grinding machine having wheels, between which there is arranged a part to be ground, and heads carrying the wheels, which process has moving the wheels closer to one another by applying pressure on the part for the grinding thereof, such that vibrations are generated in the grinding machine due to grinding, measuring the vibrations due to grinding, and introducing, depending on the measurement, an active damping force (F.sub.act) parallel to the force flow of the grinding machine and by means of using an inertial actuator acting directly on one of the heads, such that the vibrations due to grinding are attenuated.

A tooling base assembly for holding a workpiece is disclosed. In one example, the tooling base assembly includes a base assembly and a clamping assembly that imparts an inward radial force towards a center of the base assembly on the workpiece to securely retain and precisely locate the workpiece to the base assembly.

A tooling base assembly for holding a workpiece is disclosed. In one example, the tooling base assembly includes a base assembly and a clamping assembly that imparts an inward radial force towards a center of the base assembly on the workpiece to securely retain and precisely locate the workpiece to the base assembly.

A positioning unit includes two control carriages and a work carriage, it being possible to move the two control carriages and the work carriage on tracks that extend in parallel with one another. There is a working arm being articulated on a work base point on the work carriage and a control arm being articulated on a control base point on each of the control carriages. The control arms are articulated on the working arm at a control point of the working arm, the control point being spaced apart at a predefined lambda distance (d) from an end of the working arm that forms a working-point end and faces away from the work base point, and the two control base points and the work base point defining a triangle. At least two carriages of the two control carriages and the work carriage are movably arranged on a shared guide.

A positioning device, comprising a base element, a carrier element to be positioned relative to the base element along a z-axis as well as at least one first and one second slide element, wherein the first or second slide element on the one hand is disposed displaceably by means of a first or second base guide device along a first or second base line on the base element and on the other hand by means of a first or second ascent guide device along a first or second ascent line on the carrier element, wherein the first or second ascent line and the first or second base line run in a projection along the z-axis parallel to one another and with respectively constant different angles of inclination relative to the z-axis, and wherein the first and the second ascent guide device are arranged with respect to one another in such a manner that in at least one projection perpendicular to the z-axis, the first and the second ascent line are inclined opposite to one another relative to the z-axis. It is provided that for the synchronous displacement of the first and second slide element the positioning device comprises at least one drive device which comprises a rotary drive having an axis of rotation parallel to the z-axis and a coupling element, wherein the coupling element couples the rotary drive to the first and/or second slide element in such a manner that a rotational movement of the rotary drive causes a synchronous displacement of the first and second displacement element along the respective base lines.

A positioning device, comprising a base element, a carrier element to be positioned relative to the base element along a z-axis as well as at least one first and one second slide element, wherein the first or second slide element on the one hand is disposed displaceably by means of a first or second base guide device along a first or second base line on the base element and on the other hand by means of a first or second ascent guide device along a first or second ascent line on the carrier element, wherein the first or second ascent line and the first or second base line run in a projection along the z-axis parallel to one another and with respectively constant different angles of inclination relative to the z-axis, and wherein the first and the second ascent guide device are arranged with respect to one another in such a manner that in at least one projection perpendicular to the z-axis, the first and the second ascent line are inclined opposite to one another relative to the z-axis. It is provided that for the synchronous displacement of the first and second slide element the positioning device comprises at least one drive device which comprises a rotary drive having an axis of rotation parallel to the z-axis and a coupling element, wherein the coupling element couples the rotary drive to the first and/or second slide element in such a manner that a rotational movement of the rotary drive causes a synchronous displacement of the first and second displacement element along the respective base lines.

A positioning device, comprising a base element, a carrier element to be positioned relative to the base element along a z-axis as well as at least one first, second, third and fourth slide element, wherein the first, second, third or fourth slide element on the one hand is disposed displaceably by means of a first, second, third or fourth base guide device along a first, second, third or fourth base line on the base element and on the other hand by means of a first, second, third or fourth ascent guide device along a first, second, third or fourth ascent line on the carrier element, wherein the first, second, third or fourth ascent line and the first, second, third or fourth base line run in a projection along the z-axis parallel to one another and with respectively constant different angles of inclination relative to the z-axis. It is provided that the first, second, third and fourth ascent guide device are arranged with respect to one another in such a manner that respectively in at least one projection perpendicular to the z-axis, the first and the second ascent line or the third and fourth ascent line, respectively, are inclined opposite to one another relative to the z-axis so that a synchronous displacement of the first, second, third and fourth slide element relative to the base element brings about a displacement of the carrier element relative to the base element exclusively along the z-axis.